Impact of building materials on radio waves

There is an increasing expectation that wireless services should be ubiquitously available, with seamless connectivity whether the user is indoors or outdoors.  It is therefore important that the impact of buildings on the propagation of radiowaves be understood and reliably characterised.  Although many measurements have been made over the decades, it is not always easy[…]

Interference studies in the 2.3 GHz band

MOD had been considering the implications of clearing spectrum for release in the 2.3 GHz bands.  This involved not only re-planning the frequency use of existing and future MOD systems but also consideration of the potential for interference to and from these systems with respect to anticipated use of the released spectrum, namely LTE.  These studies provided[…]

Spectrum allocation strategy and spectrum fees

The study addressed the various options for the allocation of spectrum ranging from directed awards through to auctions and considered the typical services for which each approach might be applicable.  In addition methods adopted for renewal and reassignment (migration) of existing were provided and also information on introduction of secondary trading.  In addition the use of spectrum[…]

Sharing between IMT and DTT

This study considered the feasibility of co-channel co-existence between IMT and DTT systems operating in the 470 – 694/698 MHz band. The study focussed on the impact of interference from IMT into DTT systems. Due to relatively high antenna gains, EIRP values and fixed antenna masts positioned above the clutter, the protection of DTT receivers[…]

Breathing apparatus telemetry interference

The study estimated the risk of interference into breathing apparatus telemetry systems operating at 862.9625 MHz used by the Fire and Rescue Services (FRS) in the UK.  The work undertaken fell into two parts; in the first part laboratory testing of breathing apparatus telemetry systems was undertaken to establish relevant interference limits while the second[…]

Mobile traffic off-load

The study conducted for the EC, DG CONNECT, considered the possible impacts of off-loading from macro-cellular networks using Wi-Fi, femtocells, and/or picocells.  It assessed the potential socio-economic benefits of traffic off-load in achieving DAE (Digital Agenda for Europe) goals, and the amount of spectrum that will be needed to achieve those benefits. The study considered[…]

Co-existence in 1.4 GHz band

Undertook a number of interference studies to examine the potential of releasing the 1.4 GHz band for mobile as part of the preparations for WRC-15.   This included development of co-channel and adjacent band interference scenarios to examine the impact of IMT emissions on radar receivers operating in 1300-1400  MHz band; investigation into the potential for co-channel[…]

Frequency band support for future mobile handsets

The study undertaken with the consulting firm RTT reviewed the evolution of global cellular frequency bands and multi-band handset support and considered the design challenges associated with supporting new frequency bands and the associated costs and benefits of such support.  The likely relationship between the number of frequency bands supported and the RF cost and[…]

Unintended mobile roaming

The study identified key mechanisms resulting in unintended roaming of mobile devices to nearby neighbouring country cellular networks and proposed potential solutions in-line with international practices based on benchmarking.  These solutions included potential mitigation measures as well as the outline of possible approaches to address poor signal coverage at coastal areas and within buildings, especially high[…]

Sharing in 800 MHz band

The study identified technical constraints that would apply if LTE, HSPA+ and GSM‑R base stations were operating in adjacent spectrum in the 800 MHz band.  As part of the study the key interference (sharing) mechanisms were identified as shown in red below: The co-existence analysis was based on the calculation of the effective interfering emission power[…]